Possession by an animal of a head or having a head-like anterior end.

A can be associated with a , with a concentration of , with a mouth, and also with various amounts of protective or otherwise useful ornamentation. In particular, it is the head, in most animals, that encounters new locations or situations first.

The possession of a head is another feature one typically sees in the Bilateria, though with most adult , which are radially symmetrical are an exceptions.

It is difficult indeed to imagine bilateral symmetry without also some degree of cephalization. Why, after all, have a front if that front otherwise is no different from one's back or sides? Indeed, what is a front if it is no different from these other perspectives?